Lift YOLO annotation image file association restrictions

[mfl28]

• Associates YOLO annotation files with image files using annotation file base-names instead of assuming images with names <annotation_base_name>.jpg. This change allows to use YOLO annotations with all supported image files (as long as the mapping of annotation base name to image file is 1 to 1).
• Adds unit test.

Closes #107.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (71410cf) 86.37% compared to head (49320b2) 86.57%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #108      +/-   ##
============================================
+ Coverage     86.37%   86.57%   +0.19%     
- Complexity     1479     1482       +3     
============================================
  Files            95       95              
  Lines          5922     5928       +6     
  Branches        530      531       +1     
============================================
+ Hits           5115     5132      +17     
+ Misses          535      526       -9     
+ Partials        272      270       -2     

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

100.0% Coverage
0.0% Duplication